<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
    <script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
    <!-- 生产环境中不建议使用 -->
    <script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
    <title>Document</title>
</head>

<body>
    <div id="app"></div>
</body>


<script type="text/babel">
    class Guoxiao extends React.Component{
        constructor(){
            super()
            this.state = {
                msg: 'hello , React!'
            }
        }

        render(){
            // console.log(this)
            return (<div>
                        <input type='button' value='改变' onClick={this.show.bind(this)}/>
                        <br/>
                        <h1>今天是個好日子</h1>
                        <h3>{this.state.msg}</h3>
                        <p>下雪了，好開心</p>
                    </div>)
        }

        show(){
            this.setState({
                msg: '你好,React~~~~~~~~~~~'
            })
            // this.state.msg = `你好,React~~~~~~~~~~~~`
            console.log(this.state);
            
        }
    }
    ReactDOM.render(<Guoxiao/>,app)
</script>
</html>